{"id":"6b269392-9eba-40b5-acb6-55c882b20ba6","title":"Suspicious File Drop by Exchange","description":"Detects suspicious file type dropped by an Exchange component in IIS","author":"Florian Roth (Nextron Systems)","status":"test","level":"medium","date":"2022-10-04","modified":"","tags":["attack.persistence","attack.t1190","attack.initial-access","attack.t1505.003"],"technique_ids":["T1190","T1505.003"],"logsource":{"product":"windows","category":"file_event"},"falsepositives":["Unknown"],"references":["https://www.microsoft.com/security/blog/2022/09/30/analyzing-attacks-using-the-exchange-vulnerabilities-cve-2022-41040-and-cve-2022-41082/","https://www.gteltsc.vn/blog/canh-bao-chien-dich-tan-cong-su-dung-lo-hong-zero-day-tren-microsoft-exchange-server-12714.html","https://en.gteltsc.vn/blog/cap-nhat-nhe-ve-lo-hong-bao-mat-0day-microsoft-exchange-dang-duoc-su-dung-de-tan-cong-cac-to-chuc-tai-viet-nam-9685.html"],"source_path":"rules/windows/file/file_event/file_event_win_exchange_webshell_drop_suspicious.yml","source_sha256":"4382699949ea9d9d8c850fe0cbffe0d0164f5372afa2f5611ca7f436a8648f02","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/file/file_event/file_event_win_exchange_webshell_drop_suspicious.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious File Drop by Exchange\nid: 6b269392-9eba-40b5-acb6-55c882b20ba6\nrelated:\n    - id: bd1212e5-78da-431e-95fa-c58e3237a8e6\n      type: similar\nstatus: test\ndescription: Detects suspicious file type dropped by an Exchange component in IIS\nreferences:\n    - https://www.microsoft.com/security/blog/2022/09/30/analyzing-attacks-using-the-exchange-vulnerabilities-cve-2022-41040-and-cve-2022-41082/\n    - https://www.gteltsc.vn/blog/canh-bao-chien-dich-tan-cong-su-dung-lo-hong-zero-day-tren-microsoft-exchange-server-12714.html\n    - https://en.gteltsc.vn/blog/cap-nhat-nhe-ve-lo-hong-bao-mat-0day-microsoft-exchange-dang-duoc-su-dung-de-tan-cong-cac-to-chuc-tai-viet-nam-9685.html\nauthor: Florian Roth (Nextron Systems)\ndate: 2022-10-04\ntags:\n    - attack.persistence\n    - attack.t1190\n    - attack.initial-access\n    - attack.t1505.003\nlogsource:\n    product: windows\n    category: file_event\ndetection:\n    selection:\n        Image|endswith: '\\w3wp.exe'\n        CommandLine|contains: 'MSExchange'\n    selection_types:\n        TargetFilename|endswith:\n            - '.aspx'\n            - '.asp'\n            - '.ashx'\n            - '.ps1'\n            - '.bat'\n            - '.exe'\n            - '.dll'\n            - '.vbs'\n    condition: all of selection*\nfalsepositives:\n    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1190","id":"T1190","name":"Exploit Public-Facing Application","page":"techniques/enterprise/T1190/"},{"key":"enterprise/T1505.003","id":"T1505.003","name":"Web Shell","page":"techniques/enterprise/T1505.003/"}],"data_path":"data/detection-rules/6b269392-9eba-40b5-acb6-55c882b20ba6.json","kind":"sigma"}